Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Hyperbranched poly(ether ketone)s (PEK's) were synthesized via A 3 + B 2 polymerization approach without forming cross-linked products, because the polymer-forming process based on Friedel−Crafts reaction was kinetically controlled by the solubility difference of monomers in the viscous hydrophilic reaction medium, po…
The self-assembly mechanism and the associated molecular dynamics are studied for a series of poly- l -lysine-functionalized polyphenylene dendrimer melts as a function of the core size (generation), functionality, and polypeptide length using X-rays, solid-state NMR, calorimetry, and dielectric spectroscopy. A striki…
Abstract Nitroxide‐substituted polyether was synthesized as a cathode‐active material for a secondary battery. Anionic ring‐opening polymerization of a TEMPO‐bearing glycidyl ether was carried out under bulk conditions to yield the corresponding polymer with the molecular weight of >10 4 . The obtained polymer was…
Buckling of multiwalled carbon nanotubes (MWCNTs) subjected to bending deformation is studied using molecular dynamics simulations. We show that the initial buckling mode of a thick MWCNT is quite different from that of a thin MWCNT. Only several outer layers buckle first while the rest inner layers remain stable in a…
Abstract The electronic structure of CuAlO 2 and CuScO 2 delafossites is investigated by means of optical absorption measurements under pressure and ab initio band structure calculations. Measurements are carried out on CuAlO 2 monocrystals and pulsed laser deposited CuAlO 2 and CuScO 2 thin films up to 20 GPa. CuAlO…
CdSe nanocrystals were modified with small ligand molecules in order to render them compatible with a conducting polymer matrix. Modified NCs were characterized by NMR, optical spectroscopy, electrochemistry. Hybrid materials based on such modified nanocrystals and a conducting polymer (MDMO-PPV, P3HT or P3OT) were pr…
Barium zirconate titanate Ba(Zr0.2Ti0.8)O3 (BZT) thin films on La0.7Sr0.3MnO3 (LSMO)-coated Si and Pt∕Ti∕SiO2∕Si substrates have been prepared by pulsed laser deposition and crystallized in situ at 650°C. Four capacitor types of LSMO∕BZT∕LSMO∕Si, Pt∕BZT∕LSMO∕Si, Pt∕BZT∕Pt∕Si, and Pt∕BZT∕LSMO∕Pt∕Si were prepared to inv…
The polarity and accessibility to the interior of several dendrimers using phenanthrene, anthracene and tetrabenzonaphtalene as probe molecules have been investigated. In addition the prospective application of the dendrimers as drug carriers was evaluated by incorporating 5(6)-methylbenzo[1,2-c]1,2,5-oxadiazole N 1-o…
The discovery that a number of cobalt-dioxolene complexes undergo photoswitchable behavior was reported in the recent past. This phenomenon is always associated with valence tautomeric interconversion processes involving low-spin cobalt(III) and high-spin cobalt(II) species. Herein is stressed the strong formal correl…
Reversible addition fragmentation chain transfer (RAFT) living radical polymerization has been utilized successfully to allow the systematic tuning of photochromic switching rates in a rigid, ophthalmic quality, polymer matrix. Block copolymers of poly(styrene) and poly( n -butyl acrylate) were synthesized using a RAF…
The unique optical properties of gold nanorods, which exhibit tuneable absorption as a function of their aspect ratio, suggest that they might have potential applications in coatings for solar control on windows. Here we explore the properties of coatings produced by attaching gold nanorods to the surface of glass. Su…
The thermoluminescence (TL) studies of CaS : Bi nanocrystalline phosphors prepared by the wet chemical co-precipitation method and exposed to γ-rays have been discussed. The average grain size of the samples was estimated as 35 nm using Scherrer's equation. The samples exhibit a complex TL glow curve with multiple pea…
We examine the Breit-Wigner-Fano (BWF) line shape in the Raman spectra of carbon single-wall nanotubes (SWNTs) dispersed in aqueous suspensions. Bundling and electronic effects are studied by comparing undoped SWNTs (C-SWNTs) to boron-doped nanotubes (B-SWNTs) in a variety of different surfactant solutions. For SWNTs…
The origin of ferromagnetism in diluted magnetic semiconductors is still an open question, yielding a great deal of research across the world. This work focuses on the Co-Zn-O system. Room-temperature ferromagnetism is observed after a partial reaction of Co3O4 and ZnO, which can be ascribed neither to carrier mediati…
Surface defects on the substrate electrode have significant effects on electropolymerization processes. Influence of surface defects mechanically formed on a Pt electrode on electrochemical polymerization of aniline was investigated. Interestingly, it was found that existence of such surface defects leads to more favo…
Neste trabalho foi investigada a influência da concentração de uma mistura dos emulsificantes nonilfenol etoxilado e sulfato sódico de nonilfenol etoxilado (não iônico e iônico, respectivamente) e concentração de protetor coloidal, poli (álcool vinílico) na estabilidade coloidal de látices do copolímero acetato de vin…
A series of composite latex particles were prepared by two stage emulsion polymerization. Monodisperse acrylic particles, with an average particle size Dp z = 160 nm, were firstly synthesized. The second step consisted of styrene addition. Micrographs of the nanostructured particles were obtained by transmission elect…
Mg-x wt. %CuY (x = 15, 20, 25) composites were successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement shows that main phases of the as milled composites are MgH2 and Mg2Cu, and they converted into Mg and MgCu2 after dehydrogenation, respectively. Pressure-Composition-Isotherm…
The professional modeling software package CrysVUn was employed to study the process of a large sapphire single crystal growth using Kyropoulos method. The influence of gas pressure on thermal field, solid-liquid interface shape, gas velocity field and von Mises stress were studied for the first time. It is found that…
This paper deals with chain graph models under alternative AMP interpretation. A new representative of an AMP Markov equivalence class, called the largest deflagged graph, is proposed. The represen...